LM3533_15 Datasheet, PDF (1/63 Pages) Texas Instruments – Complete Lighting Power Solution for Smartphone Handsets

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LM3533
SNOSC68C – APRIL 2012 – REVISED SEPTEMBER 2015
LM3533 Complete Lighting Power Solution for Smartphone Handsets
1 Features
•1 Drives Two Parallel High-Voltage LED Strings for
Display and Keypad Lighting
• High-Voltage Strings Capable of up to 40-V
Output Voltage and up to 90% Efficiency
• Up to 30 mA per Current Sink (Both Backlight and
Indicator)
• 14-Bit Equivalent Exponential Dimming With 8-Bit
Programmable Backlight Code
• Selectable Analog ALS Input with 128
Programmable Gain-Setting Resistors or PWM
ALS Input With Internal Low-Pass Filter
• PWM Input for Content Adjustable Brightness
Control
• Five Low-Voltage Current Sinks for Indicator LEDs
• Integrated Charge Pump for Improved Efficiency
and V_IN Operating Range
• Internal Pattern Generation Engine
• Fully Configurable LED Grouping and Control
• Four Programmable Overvoltage Protection
Thresholds (16 V, 24 V, 32 V, and 40 V)
• Programmable 500-kHz and 1-MHz Switching
Frequency
• 27-mm² Total Solution Size
2 Applications
• Power Source for Smart Phone Illumination
• Display, Keypad and Indicator Illumination
• RGB Indicator Driver
3 Description
The LM3533 is a complete power source for
backlight, keypad, and indicator LEDs in smartphone
handsets. The high-voltage inductive boost converter
provides the power for two series LED strings for
display backlight and keypad functions (HVLED1 and
HVLED2). The integrated charge pump provides the
bias for the five low-voltage indicator LED current
sinks (LVLED1 to LVLED5). All low-voltage current
sinks can have a programmable pattern modulated
onto their output current for a wide variety of blinking
patterns.
Additional features include a pulse width modulation
(PWM) control input for content adjustable backlight
control (CABC), and an ambient light sensor interface
(ALS) with an internal 8-bit ADC to provide automatic
current adjustment based upon ambient light
conditions. Both the PWM and ALS inputs can be
used to control any high- or low-voltage current sink.
The LM3533 is fully programmable via an I²C-
compatible interface. The device is available in a
20-pin DSBGA and operates over a 2.7-V to 5.5-V
input voltage range and a −40°C to +85°C
temperature range.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3533
DSBGA (20)
2.04 mm × 1.78 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VIN = 2.7 V to 5.5 V
Typical Application Circuit
L
D1
VOUT up to 40 V
CIN
COUT
VALS
Ambient Light
Sensor
IN
SW
OVP
VIN
C+
ALS
CP
C-
SDA
SCL
HWEN
INT
PWM
HVLED1
HVLED2
CPOUT
LVLED1
LVLED2
LVLED3
CPOUT
PGND
LVLED4
LVLED5
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.